Number of messages approximates a poisson distribution


A statistics professor receives an average of five e-mail messages per day from students.

Assume the number of messages approximates a Poisson distribution.

a. What is the probability that on a randomly selected day she will have no messages?

b. What is the probability that on a randomly selected day she will have five messages?

c. What is the probability that on a randomly selected day she will have two messages?

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Basic Statistics: Number of messages approximates a poisson distribution
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